<?php
/*
 * MiniMe - a minimalistic OStatus complient microblogging tool
 * Copyright (C) 2010, Tuomas Koski - koski.tuomas@gmail.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * @author     Tuomas Koski <koski.tuomas@gmail.com>
 * @copyright  Tuomas Koski
 * @license    http://www.gnu.org/licenses/lgpl.txt
 */
class Activitystream_Verb implements Atom_ChildElement {

    private $verb;
    
    const VERB_FOLLOW   = "http://activitystrea.ms/schema/1.0/follow";
    const VERB_UNFOLLOW = "http://ostatus.org/schema/1.0/unfollow";
    const VERB_POST     = "http://activitystrea.ms/schema/1.0/post";
    const VERB_TAG      = "http://activitystrea.ms/schema/1.0/tag";
    
    
    const ELEMENT_VERB = "verb";
    
    public function __construct($verb) {
        $this->setVerb($verb);
    }
    
    private function setVerb($verb) {
        if(empty($verb)) {
            throw new Exception("ObjecType cannot be set empty.");
        }
        $this->verb = $verb;
    }
    
    public function getVerb() {
        return $this->verb;
    }
    
    /**
     * This should return elemnt representing something similar to:
     * <activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
     * 
     * @return DOMElement
     */
    public function asDomElement(DOMDocument $dom) {
        return $dom->createElement(ActivityStream::AS_NS_PREFIX . ':' . self::ELEMENT_VERB, $this->verb);
    }
    
    public static function buildFromDOMElement(DOMElement $elm) {
        $author = new Activitystream_Verb($elm->nodeValue);
        return $author;
    }
}